S-91583A615 5/8"-11 x 3 3/4" ASME B18.2.6, ASTM A325, ASTM F3125 Medium-Strength Steel Heavy Hex Head Screws for Structural Applications

Key Features & Benefits at a Glance

• Superior corrosion protection with hot-dipped galvanized steel coating for extended service life in harsh environments
• Exceptional load-bearing capacity with 120,000 psi tensile strength for heavy-duty structural applications
• Optimized thread engagement through UNC coarse threading and Class 2A fit ensures reliable installation and vibration resistance
• Enhanced torque transmission via external hex drive and substantial 1 1/16" head width for secure fastening
• Controlled clamping force with 2½" grip length and partial threading for precise load distribution
• Industry-standard compliance meeting ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for structural integrity
• Environmental regulation adherence with RoHS 3 and REACH compliance for global industrial use

Professional Applications & Engineering Value

These Grade A325 hex head screws deliver critical performance in structural steel connections, bridge construction, and heavy machinery assembly. The hot-dipped galvanized steel construction provides exceptional corrosion resistance, solving the common industrial problem of fastener degradation in exposed or high-moisture environments. The partially threaded design with 2½" grip length creates a controlled transition between threaded and unthreaded sections, preventing stress concentration and ensuring uniform load transfer across connected materials. With UNC coarse threads and Class 2A thread fit, these fasteners offer superior resistance to vibration loosening while maintaining easy installation in structural steel applications. The combination of 120,000 psi tensile strength and Rockwell C19 hardness ensures reliable performance under extreme structural loads, making them ideal for critical connections where failure is not an option.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerances and UNC 5/8"-11 coarse threading. These hex head screws conform to ASME B18.2.6 dimensional specifications and meet material requirements of ASTM A325 and ASTM F3125 for high-strength structural bolts. Fully compliant with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations for chemical safety, ensuring suitability for industrial applications worldwide.